Thomas h



(No Model.) l

T. BU'RRIDGR e APPARATUS fozRPURIEYINe IRON. N0.V274,7l'7. V Patented Mar.'27,1883.

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UNITED STATES PATENT OEEICE.

THOMAS E; BUEEIDGE, or sr. LoUIs, MISSOURI, ASSIGNOE 0EA ONE-THIRD To WILLIAM LEEYNOLDS, 0E SAME PLAGE.

APPARATUS FOR PURIFYING IRON.

SPECIFICATIN forming part of Letters Patent No. 274,717, dated March 27, 1883,

` Application fledOctovber 18,1882. (No model.) i

To allwhom it may concern.-

Be it known that I, THOMAS H. BURRIDGE,

of St. Louis, in the State of Missouri, have invented a certain -new and useful Apparatus for Purifying Iron, of which the following is a full, clear, and exact description, reference beinghad to the accompanying drawings, forming part of this specification.

My invention relates to an improved appa ratusfor supplyin g to the air-blast of a converter or iron-furnace an ingredient in ne powder or gaseous condition to be carried by the blast to the metal for the `purification of the same. For instance, finely-powdered lime may be used to combine with the phosphorus contained in the iron in a converter to form phosphate of lime. Other substances may be used for removal of other noxious matters.

AThe apparatus has a revolving trough surwhich the contents come in contact, whose open ends descend into the trough, and supply air to take the place of the air drawn out with the blast-current. These pipes connect with the blast-pipe beneath.

Figure l is a horizontal section on line l l, Fig. 2. Fig. 2 is a vertical section at angular line 2 2, Fig. 1.

A is an air -blast pipe leading from the blower to a Bessemer or other converter, or to a furnace containing melted iron to be dephosphorized. An annular casting or case consistingofa lower member or body, B, andan upper member or cap, G, is placed in or forms part of the blast-pipe, being firmly secured to the pipe proper, A, at top and'bottom, as shown. The case is of larger diameter than the pipe A, forming an annular recess, b, that receivesthe annular trough D. The outer side, d, ofthe trough is vertical; but the inner side, d', inclines inward, thus contracting upwardly and serving to accelerate the speed of the current and to concentrate the same, so as to form a suction at the top of the trough, or, rather, to increase the amount of suction tol drawout the contents of the trough and mix itwith the air ascending through pipe A. The cap C has a downwardly-daring circular ange, c, forming a mouth to the upper part of pipe A. Thecap has one or more hoppers,'E, for the purpose of feeding finely-powdered slaked lime y to the trough D. The hopper has two sliding valves, e and e', one at or near the top and the other at or near the bottom, the purpose being to admit the lime-powder without the admission of air. Thus to ll the hopper the upper valve, e, is

opened and the lime emptied in.y Then the upper valve is closed and the lower valve, e', opened, allowing the lime-powder to fall into the circular trough D. f

D is a bevel cog-wheel upon the circumference of the trough, engaged by acog-wheel, F, upon the shaft G. The shaft G turns in a stuffing-box, H. 1t carries a pulley, I, or cog-` wheel,by which it is turned, causing the revolution of the trough D. The trough may have ball-bearing J, or may be supported entirely by direct contact with the case B, or may be supported by any suitable bearing device.

K- are pipes, of which there maybe one vor more, (four being shown.) The pipes K communicate at the lower end, k, with tire interior of the b1astpipe. They ascend above the cap U, where they have a return bend extending downward through the cap and ending at k', near the bottom of the trough, said end being open, so that air can pass through it into the trough to take the place of that drawn out with the lime at the top. The ends of the pipes act as agitators to stir the lime in the trough and assist its escape. The pipes K have valves L to regulate the amount of air passing through them.. I have more particularly described apparatus tor the dephosphorizing of iron; but the apparatus would be sub stantially similar it' there were furnished to the blast any substance in pulverulent condition, or any substance in the trough to produce gases for the purifying of the iron.

I claim- ,1. The combination, with the blast-pipe of a metal-furnace or converter, of a trough surrounding and in communication with the interior of the blast-pipe, and means for stirring, extending downward into the trough, for the purpose set forth.

2. A rot-ary angular trough surrounding a consisting of casting B, cap C, having aring blast-pipe ofa metaLfurnace or con verter, with mouth c, trough D, hopper E, bevel cog-Wheel xed stirrers descending into the revolving D on trough, and shaft G,ca.rrying cog-Wheel trough, for the purpose set forth. l F and pulley I, as set forth. r

5 3. The combination, with the blast-pipe A 5. The combination of blast air-pipes-Kk 7c', of a metal-furnace or converter, of n revolvmain blast-pipe A, body B C c, trough D, and ing trough surrounding said pipe, partly closed means for revolving said trough, as set forth.

at top, and in communication with the blast- THOMAS H. BURRIDGE. pipe and xed air-pipes K, extending down Witnesses: v

ro into the trough, for the purpose set forth. SAML. KNIGHT,

' 4. The combination of blast-pipe A, body GEO. H. KNIGHT. 

